JPH0674802U - Steam generator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a steam generator with a high degree of dust separation function. The contact heating surface 1 of a steam generator 6 configured as a cyclone is provided only in the exhaust part 2 of the cyclone.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a steam generator including a contact heating surface and a cyclone having an exhaust part used as a dust remover.

[0002]

[Prior art]

 Since the conventional construction type boiler cannot sufficiently separate the dust from the flue gas, a dust remover must be connected after all types of boilers, namely steam boilers and hot water boilers. An electrostatic precipitator, cloth filter or cyclone is used to remove dust.

Such dust removal has the drawback that a relatively large amount of dust is carried through the contact heating surface of the boiler. In this case, a large pipe pitch must be selected to prevent the heating surface from becoming dirty, which makes the boiler very large. Another drawback is that the boiler equipment is additionally equipped with a dust remover, which increases the equipment cost.

It is also known that the steam generator is configured as a cyclone (Japanese Patent Laid-Open No. 54-91602). In this configuration, a water pipe is provided in an annular space between an inner cylinder and an outer cylinder of the cyclone. As a result, these water pipes flow and resist the high-temperature dust-containing gas flow introduced, and a sufficient cyclone effect cannot be expected.

[0005]

[Problems to be solved by the device]

 The problem of the present invention is to improve the steam generator of the first type so that the steam generator can be made one layer smaller and at the same time ensure a high degree of dust separation from the flue gas. That is.

[0006]

[Means for Solving the Problems]

 To solve this problem, according to the present invention, the contact heating surface of the steam generator configured as a cyclone is provided only in the exhaust portion of the cyclone.

[0007]

[Effect of device]

 Thus, according to the present invention, since the contact heating surface is provided only in the inner cylinder forming the exhaust portion of the cyclone, the high temperature annular space between the inner cylinder and the outer cylinder of the cyclone, that is, the dust removal section, the flue The dust in the gas is removed, and the clean gas after dust removal is used for steam generation. Therefore, it is not necessary to cool the outer cylinder with water, and it is possible to heat the water on the contact heating surface only by convection (natural circulation). Since dust is removed before it enters the exhaust section, it has high thermal efficiency and the steam generator can be made even smaller. Furthermore, since the dust in the flue gas is removed in the range of high gas temperature, the dust does not act as a condensation nucleus forming body, thus reducing the emission of harmful substances and contributing to environmental protection.

[0008]

【Example】

 An embodiment of the invention is shown in the drawing and will be explained in more detail below.

As can be seen from FIG. 1, the contact heating surface 1 of the steam generator 6 is provided in the exhaust part 2 of the inner cylinder of the cyclone formed by the water cooling pipe walls 3 and 4 forming the inner cylinder and the outer cylinder. Has been. The steam generator can be operated as a natural circulation boiler, a forced circulation boiler or a forced once-through boiler. The water-cooled pipe walls 3 and 4 can also operate as natural circulation, forced circulation or forced flow-through heating surfaces. The tangential introduction of a flue gas stream in the form of waste gas or combustion gas produces a centrifugal force, which separates the dust contained in the gas from the flue gas.

If a high degree of waste gas purity is required, multiple cyclone vapor generators can be connected in series as shown in FIG.

In order to obtain a good centrifugal effect, the cyclone must be configured in a circular cross section as shown in FIG. 3 or an equilateral polygon as shown in FIG.

Depending on the particle size of the dust, the cyclone 8 is not provided with a gas diverting wall, or is provided with a slight gas diverting wall 5 as shown in FIG.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a steam generator according to the present invention.

FIG. 2 is a schematic vertical sectional view of a plurality of steam generators connected in series.

FIG. 3 is a cross-sectional view of a cyclone having a circular cross section taken along the line I-I in FIG.

FIG. 4 I of FIG. 1 of a cyclone whose cross section is an equilateral polygon
It is a cross-sectional view taken along the line -I.

FIG. 5 is a schematic vertical sectional view of a steam generator having a gas turning wall.

[Explanation of symbols]

 1 Contact heating surface 2 Exhaust part 6 Steam generator

Claims (11)

[Scope of utility model registration request] 1. A steam generator comprising a contact heating surface and a cyclone used as a dust remover and having an exhaust part, wherein the contact heating surface (1) of the steam generator (6) configured as a cyclone is a cyclone. A steam generator, characterized in that it is provided only in the exhaust part (2) of the. 2. A steam generator according to claim 1, characterized in that the cyclone comprises water-cooled pipe walls (3, 4). 3. Steam generator according to claim 2, characterized in that the water flows in natural circulation through the water cooling pipe walls (3, 4). 4. Steam generator according to claim 2, characterized in that the water flows in forced circulation through the water cooling pipe walls (3, 4). 5. Steam generator according to claim 2, characterized in that the water flows in forced flow through the water cooling pipe walls (3, 4). 6. Steam generator according to claim 1, characterized in that water flows in natural circulation through the contact heating surface (1) provided in the exhaust part (2). . 7. Steam generator according to one of claims 1 to 5, characterized in that water flows in forced circulation through the contact heating surface (1) provided in the exhaust section (2). 8. A steam generator according to claim 1, characterized in that the water flows in forced flow through the contact heating surface (1) provided in the exhaust section (2). 9. A gas diverting plate (5) is provided in an annular space between an inner cylinder and an outer cylinder forming an exhaust part of a cyclone, and one of the claims 1 to 8 is characterized. The steam generator described. 10. The steam generator according to claim 1, wherein a gas turning wall is not provided in the annular space between the inner cylinder and the outer cylinder of the cyclone. 11. Steam generator according to claim 1, characterized in that the flue gas is supplied tangentially in the steam generator (6).